Two names of two --s (3)

My friend keeps one dog named "Lucky" *1 or "Happy".*2

My friend's friend keeps one dog named  "Lucky" or "Happy".

I always confuse which is which. Then I realized that "Happy" was a synonym for "Lucky" in my brain.

*1 kouunna, medetai, enginoyoi, un ga yoi (as an adjective)

*2 ureshii, shiawasena, koufukuna (as an adjective)